Public server with 'lastModifiedTime' searches supported?

This might be the wrong place to ask this, but I was wondering if
there were any public databases that had implemented all of the
following characteristics (I tried looking at the IndexData web
site, but all the potential databases failed for one reason or other,
and there are so many to sift through!). I could build my own
test database, but I would rather use a "real" database.

* Support =, >, < etc queries on Bib-1 lastModifiedTime
* Does not mind me doing queries and fetching lots of records
  (I don't want too many, but could be hundreds or thousands).
* Supports scan on Bib-1 last modified time desirable (so can check
  values in index and so I can do sensible queries on database)

Basically I was wondering if it was possible to efficiently "harvest"
a Z39.50 database. The best I can think of is using last-modified-time.
Downloading the full database each time seems far to inefficient,
so I would want to find out what has changed since the last visit.

Any conventions people use for the format of last modified would
also be of interest.

Thanks!
Alan
-- 
Alan Kent (mailto:ajk@mds.rmit.edu.au, http://www.mds.rmit.edu.au/~ajk/)
Postal: Multimedia Database Systems, RMIT, GPO Box 2476V, Melbourne 3001.
Where: RMIT MDS, Bld 91, Level 3, 110 Victoria St, Carlton 3053, VIC Australia.
Phone: +61 3 9925 4114  Reception: +61 3 9925 4099  Fax: +61 3 9925 4098

Received on Thursday, 11 April 2002 03:14:11 UTC